I already have pacesetter LT's Magnaflow catback (neither item installed yet), car's a dd should i get a magnaflow high flow cat or just have my car tuned to have no cats? Any HP difference? What about sound difference with/w/o the cat. Thanks. Hope everyone had a good christmas

 

If you don't have to go to emissions, then get rid of the cat. The HP difference is pretty minimal, if any, but you will notice the exhaust sounds different - some like the sound of an exhaust with a cat though, it's all preference.